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May 26, 1931. KOCH ET Q 1,806,943

MANUFACTURE OF PAPER CONTAINERS Filed Nov. 16, 1929 Jase? Elm #711175 Patented May 26, 1931 UNITED STATES PATENT orrlcs LYDIA. B. ROCK AND JOSEPH BUCHINA, OF NEW YORK, N. Y., ASSIGNOBS 1'0 THE BEIN- I'OBCED PAPER BOTTLE CORPORATION, OF NEW YORK, N. Y., A CORPORATION MANUFACTURE OF PAPER GONTADTEBS Application filed November 16, 1929. Serial 110. 407,718.

'Our invention relatesto improvements in the manufacture of paper containers and particularly to the method of securing the flanged top in position.

Q The method consists shortly in inserting the flanged top, the flange of whichjs previously coated with adhesive renderedin a moist state into the top of the container so that the adhesive surrounding the flange of the top will be drawn backwardly around the flange andleave no portion of the adhesive to contact with the side of the container and consequently with the contents.

Hereofore it has been the custom in securin the flanged top in a container to coat the adhesive within the top edge of the containers down a certain distance into 'it. This adhesive necessarily must be in a moist state when the flanged top is inserted in the top of the container, and consequently the flange of the top as it is being forced into thecontainer will force the surplus adhesive, where the flange fits the container closely as it should do in order to make a 2 proper seal, down below the top. A ring of adhesive, more or less irregular or broken, is thus rojected into the container and necessari y gets mixed with the contents thereof, especially if such contents are in the powdered or liquid form. This is obj ectionable for sanitary as well as other reasons. The adhesive is also drawn down from the top of the container, leaving it dry and impossible to twine inwardly to form a beaded sealed edge, on account of the surface friction, see dotted lines in Figure 3.

Our invention is especially designed to overcome this defect.

1 is a plan view of the top of the 4!) container previous to being formed up.

Fig. 2 is a perspective new of the upper portion of the container, and the top, as formed up, above it.

Fig. 3 is a vertical section of the container 4 with the top inserted thereiai, the scale beve atl exa erate ln tlil; d r dwiiigs characters of referenoe indicate corresponding part.

The method which we employ is as follows We first coat the top 1 with a'margin of adhesive 2 of approximately the width of the flange to be formed and allow this margin to dry. We would, of course, treat as many tops as are necessary at one and the same time. After such treatment the top is formed up with the flange 3 as indicated in Fig. 2 with-adhesive 'on the outside periphe Before placing the top in position in the 30 top of the container 4 we moisten the adhesive band 2 on the flange 3. I We then insert the top and as the top is being inserted the adhesive band 2 on the flange 3 by contacting with the inner periphery of the container, which it is designed to fit closely,

' forces the adhesive and the surplus,if any,

backwardly towards the top edge of the con-f tainer and flange of the top. This results in not only forming a perfect sealbetween the top edge of the flange and the top edge of the container but also insures that no adhesive will pass down into the container below the bottom of the top and be liable to mix with the contents.

The advantage of our method will now apparent as it not only saves time in the manufacture and closure of the container but also insures the container from the admission of foreign matter into its contents which is an important desideratum.

On reference to Figure 3, which represents, greatly exaggerated, the top of the container inserted in position, the manner which the adhesive 2 is drawn back as shown between the flange and top, clearly illustrates the advantage of our invention, as no adhesive is caused pass inwardly below the bottom of the top of the container.

What we claim as our invention is:

' The method ofclosing and sealing containers in which the top is formed with a vertical circumferential flange, consisting in coating the top with an adhesive of the width of the flange previous to its formed up, then allowing the adhesive to ,dry, then forming up the top so that the outer periphery of the flange fits tightly within the top edge of the container, then IQO moistening the flange and then inserting the flanged top into the top of the container so as to cause the adhesive thereon to recede from the bottom edge of the flange of the top towards the top edge of the flange of the top and top edlge of the container. YDIA B. KOCH. V JOSEPH BUCHINA. 

